{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T23:06:05.186Z","years_from_j2000":26.668,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"kepler-720-b","name":"Kepler-720 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3474.772201280869,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":298.6356478,"dec_deg":44.1709388,"epoch_ra_deg":298.851096,"epoch_dec_deg":44.240789,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-720","semi_major_axis_km":8063325.23073,"periapsis_km":null,"mass_kg":3.189137641400596e+26,"mass_msun":0.000160386,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-720-b","radius_km":53639.821,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-720","host_v_mag":15.462,"eccentricity":0,"uncertainties":{"radius_km":[5102.4800000000005,10268.741000000002],"distance_ly":[114.74181368075034,122.73264493481055],"host_mass_solar":[0.068,0.111],"host_radius_solar":[0.087,0.176],"host_temperature_k":[250.53,328.49],"orbital_period_days":[7.34e-7,7.34e-7]},"host_mass_solar":0.95,"inclination_deg":89.71,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.92,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5618,"orbital_period_days":4.708326542,"transit_midpoint_bjd":2455004.44652,"equilibrium_temperature_k":1162},"designations":[{"catalog":"Exoplanet","designation":"Kepler-720 b"},{"catalog":"Host star","designation":"Kepler-720"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-01T22:58:55.274Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}